Icon of St. Adrian of Ondrusov, wearing the black koukoulion. The lapets can be seen on his shoulders.

From the 17th century, following the reforms of Patriarch Nikon, the upper vesture worn by monks of the Great Schema (skhimonakh) is in the form of a pointed hood with two long lappets which cover the back and breast. It is black in color, and embroidered with crosses, six-winged seraphim, and the text of the Trisagion. It is worn above the mantiya (monastic mantle), and is the same for both monks and nuns. In the context of monastic vows, it is called the koukoulion of kindliness, and the helmet of salvation. The koukoulion replaces the klobuk which is worn by the monastics of lower ranks.